From Samsung:

Dear Seller,
This is the Samsung Apps Seller Office.
Thank you for your continued support of the Samsung Apps Seller Office.
On June 20th, In-App Purchase version 2.0 was released from the Samsung Developers website. Version 2.0 offers new functions such as ‘Support for Various Types of Items’, ‘New Recovery Function for Account-based Items’ and more for both developers and users.
Also, you can sell items in the USA if you use version 2.0. If there is an application registered by the seller which uses an In-App Purchase version lower than 2.0, users in the USA cannot purchase an item from the application. In this case, we recommend you use version 2.0 to earn more sales profits by selling items.
Visit the URL below for more details on In-App Purchase version 2.0.
http://developer.samsung.com/android/tools-sdks/In-App-Purchase-Library
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